"In recent weeks, at a time of heightened tension within the Labour party and within the wider socio-political climate of our country, there has been an extremely worrying trend of escalating abuse and hostility towards MPs," the letter said.

"Unfortunately it is women and BAME (black, Asian, minority, ethnic) women who are disproportionately affected by these incidents.

"Rape threats, death threats, smashed cars and bricks through windows are disgusting and totally unacceptable in any situation. This is acknowledged by all factions yet the simple words of condemnation offered in response are inadequate."

Paula Sherriff MP (Lynne Cameron/PA)

"We expect swift and tangible action against those who commit such acts."

The MPs called on Corbyn to commit to regular meetings with the Women's PLP, and asked him to subscribe to certain pledges, including challenging behaviour which is against Labour values.

A brick was thrown through the window of MP Angela Eagle's office (Lauren Brown/PA)

The letter comes as Owen Smith, contender for Labour leader, accused Corbyn of allowing a culture of bulling within the party.

He told Sky News: "Jeremy, of course, always says that he doesn't condone it but somehow under his leadership - we can't deny the facts that this wasn't something that we saw in the Labour Party before Jeremy Corbyn became leader - and it's now become commonplace in the Labour Party. So something has gone badly wrong under his watch."

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